Diy transformer

[Manowar1985]

Hi everybody.

I am building a transformer and I heard from someone that if for example a copper wire gauge can tolerate 1A at 230 Volts it also means that it can tolerate 10 A at 23 volts.Does the wire tolerance have to do with power or current. I am asking this because if it is true it will help me a lot in saving some space in the bobbin of the core.I really am running out of space. Thanks a lot

[vintagekiki]

https://www.google.com/search?hl=en&as_q=transformer+calculation

https://music-electronics-forum.com/forum/amplification/guitar-amps/theory-design/48224-transformers

https://engineerexperiences.com/design-calculations.html

[Helmholtz]

I heard from someone that if for example a copper wire gauge can tolerate 1A at 230 Volts it also means that it can tolerate 10 A at 23 volts.

Certainly not.

The limiting factor is the current density in the wire. Voltage doesn't matter in this context (voltage rating depends on dielectric strength of wire insulation).

Only current and not voltage heats the wire. Ten times the current requires 10 times the cross section.

There are tables for max recommended wire currents in transformers.

But, using the same core, lower voltage means less primary turns. A smaller core OTOH requires more turns than a bigger core
Transformer calculation from scratch is not a simple task at all.

[Manowar1985]

Thank you Helmholtz but is the any possibility that power heats the wire.I am not saying that voltage does this alone but maybe current with voltage. Maybe not right;

[Helmholtz]

Thank you Helmholtz but is the any possibility that power heats the wire.I am not saying that voltage does this alone but maybe current with voltage. Maybe not right;

Wire heating power is determined by wire resistance per length and current, according to P= I squared times R.
A piece of wire doesn't know (and care) what total voltage is.

BTW, the relation between terminal voltage and current in a transformer does not follow Ohm's law because of the induction involved, so V x I doesn't give wire heating power.

[vintagekiki]

https://en.wikibooks.org/wiki/Engineering_Tables/Standard_Wire_Gauge

[Manowar1985]

thanks a lot

[vintagekiki]

https://onlinelibrary.wiley.com/doi/pdf/10.1002/9781118824603.ch07
Transformer design

https://www.elprocus.com/transformer-design/
Transformer design

http://www.dicks-website.eu/coilcalculator/index.html
Coil and transformer calculator

https://www.giangrandi.ch/electronics/trafo/trafo.shtml
Calculating mains frequency power transformers

1)
https://www.youtube.com/watch?v=JV2dQdbxb5o
Calculate Turns per Volt- transformer for Amplifier

[R.G.]

"and I heard from someone that..." is almost never a good thing to insert in a sentence about transformers. Good that you asked. Give a read to some of the excellent references listed.

As a practical matter, it's almost never possible to get more than 85% of the winding window used for actual copper wire, and that gets worse if you're not skilled at doing even layer windings or are doing fancy sectionalizing and interleaving. Until you're experienced (which typically means you've buried a number of failed experiments!) go bigger on core size and/or stack to reduce turns and increase window area before counting on doing magically efficient coil winding.

[J M Fahey]

heard from someone that if for example a copper wire gauge can tolerate 1A at 230 Volts it also means that it can tolerate 10 A at 23 volts

DEFINITE NO!!!!!
It can tolerate exact same 1A, period.

Does the wire tolerance have to do with power or current.

Wire diameter/area defines current, period.

Number of turns defines voltage.

I am asking this because if it is true it will help me a lot in saving some space in the bobbin of the core.I really am running out of space.

Real estate is really limited inside a transformer window and itīs a small miracle fitting everything in.

[Manowar1985]

Thank you all.I think it is time for study.